What is inside a red color fire extinguisher ?

Question

Question

This question was previously asked in

KGMU Nursing Officer 2023 Memory-Based Previous Year Paper

Answer 1

Correct Answer: Water

Rationale:

Red fire extinguishers are commonly known as water-based extinguishers. They are designed specifically for Class A fires, which involve ordinary combustible materials such as wood, paper, cloth, and plastics.
The extinguishing agent inside red fire extinguishers is water. Water cools the fire by lowering the temperature of the burning materials below their ignition point, effectively extinguishing the flames.
These extinguishers are straightforward in operation and highly effective for fires fueled by solid materials, making them a popular choice for domestic and workplace environments.

Explanation of Other Options:

Carbon dioxide

Rationale: Carbon dioxide (CO₂) extinguishers are typically black in color, not red. They are designed for Class B (flammable liquids) and Class C (electrical) fires. CO₂ extinguishers work by displacing oxygen around the fire and creating a cold discharge that cools the fire.

Dry chemical

Rationale: Dry chemical extinguishers, often marked with a blue label, are versatile and can be used for Class A, B, and C fires. The extinguishing agent is usually a powder, such as monoammonium phosphate, which interrupts the chemical reaction of the fire.

Foam

Rationale: Foam extinguishers are identified by a cream-colored label and are used for Class A and Class B fires. Foam smothers the fire by creating a barrier between the fuel and oxygen, and it also cools the surface of the burning material.

Conclusion:

Red fire extinguishers contain water and are specifically designed for Class A fires involving ordinary combustibles. They are not suitable for fires involving flammable liquids, electrical equipment, or cooking oils, as water can worsen these types of fires. Understanding the color coding and purpose of fire extinguishers is crucial for effective and safe fire suppression.